Spears' gig, which follows similar engagements by Celine Dion, Elton John and Shania Twain, is scheduled to begin Dec. 27 and include 50 performances over the next two years. Financial terms weren't released, though TMZ reported that Spears is set to make nearly $15 million a year for her work.

In addition to the Vegas announcement, Spears said Tuesday that she'll release a new studio album -- the follow-up to 2011's "Femme Fatale" -- on Dec. 3.